cve-2024-42063
Vulnerability from cvelistv5
Published
2024-07-29 15:52
Modified
2024-12-19 09:11
Severity ?
Summary
bpf: Mark bpf prog stack with kmsan_unposion_memory in interpreter mode
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3189983c26108cf0990e5c46856dc9feb9470d12Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b30f3197a6cd080052d5d4973f9a6b479fd9fff5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d812ae6e02bd6e6a9cd1fdb09519c2f33e875fafPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e8742081db7d01f980c6161ae1e8a1dbc1e30979Patch
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Mark bpf prog stack with kmsan_unposion_memory in interpreter mode\n\nsyzbot reported uninit memory usages during map_{lookup,delete}_elem.\n\n==========\nBUG: KMSAN: uninit-value in __dev_map_lookup_elem kernel/bpf/devmap.c:441 [inline]\nBUG: KMSAN: uninit-value in dev_map_lookup_elem+0xf3/0x170 kernel/bpf/devmap.c:796\n__dev_map_lookup_elem kernel/bpf/devmap.c:441 [inline]\ndev_map_lookup_elem+0xf3/0x170 kernel/bpf/devmap.c:796\n____bpf_map_lookup_elem kernel/bpf/helpers.c:42 [inline]\nbpf_map_lookup_elem+0x5c/0x80 kernel/bpf/helpers.c:38\n___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997\n__bpf_prog_run256+0xb5/0xe0 kernel/bpf/core.c:2237\n==========\n\nThe reproducer should be in the interpreter mode.\n\nThe C reproducer is trying to run the following bpf prog:\n\n    0: (18) r0 = 0x0\n    2: (18) r1 = map[id:49]\n    4: (b7) r8 = 16777216\n    5: (7b) *(u64 *)(r10 -8) = r8\n    6: (bf) r2 = r10\n    7: (07) r2 += -229\n            ^^^^^^^^^^\n\n    8: (b7) r3 = 8\n    9: (b7) r4 = 0\n   10: (85) call dev_map_lookup_elem#1543472\n   11: (95) exit\n\nIt is due to the \"void *key\" (r2) passed to the helper. bpf allows uninit\nstack memory access for bpf prog with the right privileges. This patch\nuses kmsan_unpoison_memory() to mark the stack as initialized.\n\nThis should address different syzbot reports on the uninit \"void *key\"\nargument during map_{lookup,delete}_elem."
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    "dateReserved": "2024-07-29T15:50:41.166Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-42063\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-07-29T16:15:06.053\",\"lastModified\":\"2024-09-05T17:42:12.670\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf: Mark bpf prog stack with kmsan_unposion_memory in interpreter mode\\n\\nsyzbot reported uninit memory usages during map_{lookup,delete}_elem.\\n\\n==========\\nBUG: KMSAN: uninit-value in __dev_map_lookup_elem kernel/bpf/devmap.c:441 [inline]\\nBUG: KMSAN: uninit-value in dev_map_lookup_elem+0xf3/0x170 kernel/bpf/devmap.c:796\\n__dev_map_lookup_elem kernel/bpf/devmap.c:441 [inline]\\ndev_map_lookup_elem+0xf3/0x170 kernel/bpf/devmap.c:796\\n____bpf_map_lookup_elem kernel/bpf/helpers.c:42 [inline]\\nbpf_map_lookup_elem+0x5c/0x80 kernel/bpf/helpers.c:38\\n___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997\\n__bpf_prog_run256+0xb5/0xe0 kernel/bpf/core.c:2237\\n==========\\n\\nThe reproducer should be in the interpreter mode.\\n\\nThe C reproducer is trying to run the following bpf prog:\\n\\n    0: (18) r0 = 0x0\\n    2: (18) r1 = map[id:49]\\n    4: (b7) r8 = 16777216\\n    5: (7b) *(u64 *)(r10 -8) = r8\\n    6: (bf) r2 = r10\\n    7: (07) r2 += -229\\n            ^^^^^^^^^^\\n\\n    8: (b7) r3 = 8\\n    9: (b7) r4 = 0\\n   10: (85) call dev_map_lookup_elem#1543472\\n   11: (95) exit\\n\\nIt is due to the \\\"void *key\\\" (r2) passed to the helper. bpf allows uninit\\nstack memory access for bpf prog with the right privileges. This patch\\nuses kmsan_unpoison_memory() to mark the stack as initialized.\\n\\nThis should address different syzbot reports on the uninit \\\"void *key\\\"\\nargument during map_{lookup,delete}_elem.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: bpf: marcar la pila de programas bpf con kmsan_unposion_memory en modo int\u00e9rprete syzbot inform\u00f3 usos de memoria uninit durante map_{lookup,delete}_elem. ========== ERROR: KMSAN: valor uninit en __dev_map_lookup_elem kernel/bpf/devmap.c:441 [en l\u00ednea] ERROR: KMSAN: valor uninit en dev_map_lookup_elem+0xf3/0x170 kernel/bpf/devmap. c:796 __dev_map_lookup_elem kernel/bpf/devmap.c:441 [en l\u00ednea] dev_map_lookup_elem+0xf3/0x170 kernel/bpf/devmap.c:796 ____bpf_map_lookup_elem kernel/bpf/helpers.c:42 [en l\u00ednea] bpf_map_lookup_elem+0x5c/0x80 kernel / bpf/helpers.c:38 ___bpf_prog_run+0x13fe/0xe0f0 kernel/bpf/core.c:1997 __bpf_prog_run256+0xb5/0xe0 kernel/bpf/core.c:2237 ========== El reproductor debe estar en el modo int\u00e9rprete. El reproductor de C est\u00e1 intentando ejecutar el siguiente programa bpf: 0: (18) r0 = 0x0 2: (18) r1 = map[id:49] 4: (b7) r8 = 16777216 5: (7b) *(u64 * )(r10 -8) = r8 6: (bf) r2 = r10 7: (07) r2 += -229 ^^^^^^^^^^ 8: (b7) r3 = 8 9: (b7) r4 = 0 10: (85) llamar a dev_map_lookup_elem#1543472 11: (95) salir Se debe a la \\\"clave * vac\u00eda\\\" (r2) pasada al ayudante. bpf permite el acceso a la memoria de pila uninit para el programa bpf con los privilegios correctos. Este parche usa kmsan_unpoison_memory() para marcar la pila como inicializada. Esto deber\u00eda abordar diferentes informes de syzbot sobre el argumento uninit \\\"void *key\\\" durante map_{lookup,delete}_elem.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-908\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"6.1.97\",\"matchCriteriaId\":\"11DA4D7A-BB0A-4555-8D1D-ECCC5108F772\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.37\",\"matchCriteriaId\":\"D72E033B-5323-4C4D-8818-36E1EBC3535F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.9.8\",\"matchCriteriaId\":\"E95105F2-32E3-4C5F-9D18-7AEFD0E6275C\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3189983c26108cf0990e5c46856dc9feb9470d12\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b30f3197a6cd080052d5d4973f9a6b479fd9fff5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d812ae6e02bd6e6a9cd1fdb09519c2f33e875faf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e8742081db7d01f980c6161ae1e8a1dbc1e30979\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
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}


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